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slub: Remove CONFIG_CMPXCHG_LOCAL ifdeffery

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Remove the #ifdefs. This means that the irqsafe_cpu_cmpxchg_double() is used
everywhere.

There may be performance implications since:

A. We now have to manage a transaction ID for all arches

B. The interrupt holdoff for arches not supporting CONFIG_CMPXCHG_LOCAL is reduced
to a very short irqoff section.

There are no multiple irqoff/irqon sequences as a result of this change. Even in the fallback
case we only have to do one disable and enable like before.

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2011-05-05 15:23:54 -05:00 • committed by Pekka Enberg
parent 8dc16c6c04
commit 1759415e63
2 changed files with 0 additions and 58 deletions
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2
include/linux/slub_def.h
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@ -37,9 +37,7 @@ enum stat_item {
struct kmem_cache_cpu {
void **freelist; /* Pointer to next available object */
#ifdef CONFIG_CMPXCHG_LOCAL
unsigned long tid; /* Globally unique transaction id */
#endif
struct page *page; /* The slab from which we are allocating */
int node; /* The node of the page (or -1 for debug) */
#ifdef CONFIG_SLUB_STATS